//
//  main.m
//  OC-基础
//
//  Created by zhongad on 2017/2/16.
//  Copyright © 2017年 zhongad. All rights reserved.
//

#import <Foundation/Foundation.h>
/*
 NSString : 不可变字符串
 
 NSMutableString : 可变字符串
 */

int main(int argc, const char * argv[]) {
    NSMutableString *s1 = [NSMutableString stringWithFormat:@"my age is 10"];
    // 拼接内容到s1的后面
    [s1 appendString:@" 11 12"];
    
    // 获取is的范围
    NSRange range = [s1 rangeOfString:@"is"];
    [s1 deleteCharactersInRange:range];
    
    NSString *s2 = [NSString stringWithFormat:@"age is 10"];
    
    NSString *s3 = [s2 stringByAppendingString:@" 11 12"];
    
    
    NSLog(@"s1=%@, s2=%@", s1, s2);
    return 0;
}

void stringExport()
{
    // 字符串的导出
    [@"Jack\nJack" writeToFile:@"/Users/apple/Desktop/my.txt" atomically:YES encoding:NSUTF8StringEncoding error:nil];
    
    
    NSString *str = @"4234234";
    NSURL *url = [NSURL fileURLWithPath:@"/Users/apple/Desktop/my2.txt"];
    [str writeToURL:url atomically:YES encoding:NSUTF8StringEncoding error:nil];
}

void stringCreate()
{
    /*
     1.字符串的创建
     */
    NSString *s1 = @"jack";
    
    //NSString *s2 = [[NSString alloc] initWithString:@"jack"];
    
    NSString *s3 = [[NSString alloc] initWithFormat:@"age is %d", 10];
    
    // C字符串 --> OC字符串
    NSString *s4 = [[NSString alloc] initWithUTF8String:"jack"];
    // OC字符串 --> C字符串
    const char *cs = [s4 UTF8String];
    
    // NSUTF8StringEncoding 用到中文就可以用这种编码
    NSString *s5 = [[NSString alloc] initWithContentsOfFile:@"/Users/apple/Desktop/1.txt" encoding:NSUTF8StringEncoding error:nil];
    
    
    // URL : 资源路径
    // 协议头://路径
    // file://
    // ftp://
    // http://weibo.com/a.png
    
    
    // http://www.baidu.com
    
    // NSURL *url = [[NSURL alloc] initWithString:@"file:///Users/apple/Desktop/1.txt"];
    NSURL *url = [NSURL fileURLWithPath:@"/Users/apple/Desktop/1.txt"];
    
    NSString *s6 = [[NSString alloc] initWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
    NSLog(@"s6=\n%@", s6);
    
    
    /*
     一般都会有一个类方法跟对象方法配对
     [NSURL URLWithString:<#(NSString *)#>];
     [NSString stringWithFormat:@""];
     [NSString stringWithContentsOfFile:<#(NSString *)#> encoding:<#(NSStringEncoding)#> error:<#(NSError *__autoreleasing *)#>];
     
     */
}
